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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c683d0a6605b388f18efd4a26b5a4f54e609641940d2edb6a103f275e6bd33' 
  AND token = 'q9i8ZQAZeStJa/GBNjd/w8DpRdki7VRXFAVJdOMqs1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}